Flat tuned systems usually sound rather lifeless. Accurate? Absolutely. Fun to listen to? Maybe, if that's your thing. A flat system can sound mid-range heavy to the human ear, due to the ear being most sensitive in the 300Hz to 3KHz area known as the vocal range. I've had studio monitors (Yamaha NS-10M's) that were ruler flat from 50Hz to 20KHz, they sounded good, yet boring at the same time. Remember, with an EQ, you're trying to correct any anomalies in room response, and not speaker response. The space the speakers are playing in greatly influence the end results. If the space has issues with reflections or bass getting stuck in certain areas of the room, the EQ will be of great help because it will correct for a poor space. Ideally, you want to EQ in the digital domain, and not analog. An analog EQ has a much greater influence over the quality of sound itself due to it introducing additional components directly in the signal path. A digital EQ will do this before the conversion to an analog waveform, so it doesn't run the gamut of capacitors, resistors, opamps, and potentiometers before it gets to the amplifier. If you were to take your exact speakers after EQing, and put them in an anechoic chamber, the final sound would be vastly different compared to being in your own listening space.
